Matches in DBpedia 2016-04 for { ?s ?p "Robert MacGregor was a British engineer, who, during the 1920s, concerned over unnecessary losses of North Sea colliers, developed the first steel hatch cover.The design was simple and consisted of five articulated leaves that stowed neatly at the end of each hatch."@en }
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- Robert_MacGregor_(engineer) comment "Robert MacGregor was a British engineer, who, during the 1920s, concerned over unnecessary losses of North Sea colliers, developed the first steel hatch cover.The design was simple and consisted of five articulated leaves that stowed neatly at the end of each hatch.".
- Q7347222 comment "Robert MacGregor was a British engineer, who, during the 1920s, concerned over unnecessary losses of North Sea colliers, developed the first steel hatch cover.The design was simple and consisted of five articulated leaves that stowed neatly at the end of each hatch.".